Devices for fluid insertion of filling yarns

ABSTRACT

The present invention relates to devices for a loom for inserting filling yarns by means of a fluid, the loom having a reed for the beating-up of the filling yarn which has just been inserted, the devices for the insertion of the filling yarns having a comb of parallel channel-forming blades that form a guide channel for the fluid, and the channel-forming blades each having a recess which corresponds to the cross-section of the guide channel and has an outlet opening which faces the place of the beating-up of the filling yarn.

United States Patent Zollinger Oct. 14, 1975 [54] DEVICES FOR FLUIDINSERTION OF 2,793,658 5/1957 Dunham 1. 139/191 FILLING YARNS 3,139,] 186/1964 Svaty et al. 139/127 [75] Inventor: Hans Zollinger, Tann-Ruti,

Switzerland Primary ExaminerHenry S. Jaudon 73 Assignee: Ruti MachineryWorks Ltd., Zurich, Mom, or firm-Donald Demo Switzerland 22 Filed: June17, 1974 ABSIRACT [21] App]. No.: 480,291

The present invention relates to devices for a 100m for [30] ForeignApplication Priority Data inserting filling yarns by means of a fluid,the loom having a reed for the beating-up of the filling yarn June 20,1973 Switzerland 8938/73 which has j been inserted, the devices for theinser tion of the filling yarns having a comb of parallel 2% 139/ 58352432 channel-forming blades that form a guide channel for i 123 127 Rthe fluid, and the channel-forming blades each having 1 m 0 are P 188 arecess which corresponds to the cross-section of the guide channel andhas an outlet opening which faces References Cited the place of thebeating-up of the filling yarn.

UNITED STATES PATENTS 8/1955 Turner 139/191 7 Claims, 2 Drawing FiguresU,s. Patent oct.14,1975 sheet 1 on 3,911,968

US. Patent Oct. 14, 1975 Sheet2of2 3,911,968

DEVICES FOR FLUID INSERTION OF FILLING YARNS BACKGROUND In known loomsof this type, the channel-forming blades are firmly connected to the layin such a manner that during the beating-up movement of the lay theyemerge completely from the shed in order to permit the reed to beat-upthe filling thread which was previously inserted and upon the followingrearward movement of the lay again move between warp yarns in order,upon the next insertion of the filling yarn, to assure the desired guidewithin the shed of the fluid serving for the insertion of the fillingyarn. The outlet opening of the recess of each channel-forming blademust, in this connection, be so directed that the filling thread whichhas been inserted in each case automatically slips out through thisopening when the channel-forming blades are moved out of the shed. Thismeans that the outlet opening substantially faces away from the place ofthe beating-up of the filling thread and faces the reed. Theintroduction of the channel-forming blades between warp yarns after eachbeating-up of the filling thread is not an easy matter, since at times awarp yarn can remain caught on a channel-forming blade or even enterinto the recess thereof, which leads to defects in weaving.

in other known power looms having devices for introducing the fillingyarns by means of compressed air, the teeth of the reeds themselves aredeveloped as channelforming blades, each having a recess to form a guidechannel for the stream of air serving for the insertion of the fillingyarn. The recess of each channel-forming blade is, in this connection,so developed and arranged that the filling yarn which has been insertedremains in each case in the guide channel during the beating-up andemerges from the guide channel only upon the following rearward movementof the lay. For this, it is necessary to provide the recess of eachblade with an outlet opening facing the beating-up point of the fillingyarn. In the case of this solution, the channel-forming blades do notemerge out of the shed and then enter again between warp yarns, forwhich reason the above described disadvantage of the known looms isavoided. On the other hand, in connection with the second type of knownlooms, it is noted that the reed and channelforming blades in theirbeating-up position have portions which extend forward beyond the pointof beating'up, said portion defining the recess which receives thefilling yarn. The said forward extending portions in their turn have theresult that the stretchers necessary to obtain a proper fabric cannot bearranged at a sufficiently small distance from the place of beating-upof the filling yarn. This has the result that the fabric shrinkssomewhat in width at the beating-up point and the warp yarns thereforeno longer extend parallel at the edge portions of the reed.

lt has been attempted to adapt the development of the stretchers and ofthe recesses of the blades which form the air guide channels to eachother in such a manner that upon the beating-up of the reed, thestretchers dip into the guide channel. This however results in anunfavorably large cross-section of the air guide channel at least in theregion of the stretchers and in a special design of the stretchers whichis less effective.

SUMMARY The main object of the present invention is to develop a loom ofthe aforementioned type, in order to avoid the above describeddisadvantages of known embodiments, in such a manner and relativelysimple fashion that it does not require either special warpyarn enteringand exiting channel-forming blades nor special stretchers in order to beable to maintain a desirably small distance between the point ofbeating-up of the filling yarn and the stretchers of customarydevelopment, and that the cross-section of the guide channels formed bythe channel-forming blades can be developed without regard to thestretchers.

This object is achieved in accordance with the invention in the loom ofthe aforementioned type essentially in the manner that thechannel-forming blades engage between teeth of the reed and are somovably arranged and controlled with respect to the reed that upon thebeating-up movement of the reed the channel-forming blades move less fartowards the beating-up point of the filling yarn than the teeth of thelay, the latter moving at least up to the outlet openings of thechannelforming blades and pushing the filling yarn which has beenpreviously introduced into the guide channel out of the guide channelbefore the filling yarn is beatenup.

With this development of the loom, the channelforming blades are not infront of the teeth of the lay at the moment that the filling yarn isbeaten-up, for which reason the stretchers can be arranged withoutdifficulty at a sufficiently small distance apart in front of the placeof the beating-up of the filling. The stretchers upon the beating-up donot enter into the guide channel for the fluid serving for the insertionof the filling yarn so that the cross-section of the guide channel canbe selected in the most suitable shape and size without regard to theconstruction of the stretchers so that specially developed stretchersare not required. The channel-forming blades need not be moved out ofthe web before the beating-up of a filling yarn and therefore need notbe introduced and be moved between the warp yarns but can remaincontinuously between the warp yarns, like the teeth of the lay.

The channel-forming blades are advisedly held by at least one ledgewhich extends on the side of the reed which faces away from the fell ofthe cloth. For the holding of the channel-forming blades there arepreferably employed two parallel ledges between which the warp yarnsextend and the shed is located.

In one advantageous embodiment a ledge which holds the channel-formingblades is fastened to supporting arms which are pivotally connected tothe lay and means are provided for deriving a predetermined swingingmovement of the supporting arms from the movement of the lay. In thisconnection the supporting arms can be seated on a shaft which issupported on the lay and on which there is furthermore fastened at leastone link arm which has a part which engages in a fixed slotted link. Inthis connection the slotted link has a course which deviates from anarcuate path around the axis of swing of the lay swords in order toimpart the channelforming blades the desired movement with respect tothe reed.

As a further development, the channel-forming blades may each have alinear edge portion on the edge thereof, which continues from the outletopening, and

' be controlled in movement with respect to the reed in such a mannerthat upon the beating-up movement of the reed the recess of eachchannel-forming blade moves out of the shed and the said linear edgeportion of each channel-forming blade comes to lie behind the fillingyarn which was previously inserted. In this connection there may beparticularly advantageous an arrangement of such a nature that in thebeating-up position of the reed the said linear edge portions of thechannel-forming blades lie in a common plane with the beating-up edgesof the reed teeth and accordingly also contribute to the beating-up ofthe filling yarn. Particularly in the last mentioned development, it isadvantageous to arrange the channel-forming blades and the teeth of thereed alternately so that a channel-forming blade follows each tooth ofthe reed.

BRIEF DESCRIPTION OF THE DRAWINGS Further details of the invention willbecome evident from the following description of an illustrativeembodiment and from the corresponding drawings which merely illustratethe subject matter of the invention, in which:

FIG. 1 shows a view in partial vertical section along the warp yarns ofthe parts of a loom of importance for the present invention, the movingparts being shown in the position in which they are upon the insertionof the filling yarn; and

FIG. 2 is a similar view in partial vertical section in which, however,the moving parts are shown in the position occupied by them during thebeating-up of the filling yarn.

DESCRIPTION OF PREFERRED EMBODIMENT The loom shown in FIGS. 1 and 2 hasa lay 11 which bears a reed 12 having linearly extending teeth 13. Thelay 11 is supported by lay swords 14 on a shaft 15 which is supported inthe stand (not shown) of the loom and permits of the swinging of the layswords 14 around a pivot 16. On the lay swords 14 there is rotatablysupported a shaft 17 which extends parallel to the lay 11 and on whichthere acts one end of each of two lay connecting rods 18. The other endof these connecting rods 18 is connected in known manner (not shown)with an eccentric or a crank with the main shaft of the loom so that,upon the rotation of the main shaft, the lay 11 moves back and forth.

Between the teeth 13 of the reed 12 there are passed in customaryfashion warp yarns 20 which together with the filling yarns (not shown)form the desired cloth 21. A shed 22 between an upper group of warpyarns and a lower group of warp yarns, which is necessary for theinsertion of the filling yarns, is formed in known manner by means ofharnesses (not shown). The beating-up of the filling yarn which has beenpreviously inserted is effected at the beating-up point 23 by means ofthe teeth 13 of the reed, as is generally known. A slight distance fromthe beating-up point 23, there are located stretchers 24 of customaryconstruction which grasp the edge portions of the resultant cloth 21 andcontinuously pull it towards the outside in order to stretch the clothwidthwise so that the warp yarns 20 of the upper group of warp yarns andof the lower groups of warp yarns extend in parallel towards thebeating-up point 23.

It will be appreciated that the development of the loom which has beendescribed above is entirely conventional, so that it is unnecessary togo into further detail. The novel feature of the device used on the loomshown consists in the following:

Parallel to the teeth 13 of the reed 12 there are providedchannel-forming blades 25 each of which engages between two reed teeth13. The reed teeth 13 and channel-forming blades 25 can be arranged oneafter the other. Advantageously, the device may be provided with fewerchannel-forming blades than reed teeth, for instance in the manner thatevery five successive reed teeth are followed by one channel-formingblade. The channel-forming blades 25 each has a recess 26 with an outletopening 27 which is directed towards the beating-up point 23 of thefilling yarn. All recesses 26 of the channel-forming blades 25 togetherform a guide channel for a fluid serving for the insertion of thefilling yarns, for instance compressed air. The said fluid is fed bymeans of a main nozzle located on the shed side and a plurality ofauxiliary nozzles 28 which are fed via hoses 29, the fluid beingsupplied from a fluid source 29A. The auxiliary nozzles 28 are arrangedvertically at suitable distances apart along the lay 11 and fastened tothe lay. The outlet openings of the nozzles 28 are so directed that astream of fluid is produced in the guide channel formed by the recesses26 of the channel-forming blades 25 transversely through the shed 22when the nozzles are placed in operation. Directly above the opening 27of recess 26, each channelforming blade 25 has a linearly extending edgeportion 30.

The channel-forming blades 25 are not parts of the reed 12 but are heldindependently of the reed on a lower ledge 31 and an upper ledge 32, thetwo of which extend parallel to the lay 11 and are arranged on the sideof the reed 12 facing away from the beating-up point 23. The lower ledge31 is clamped in a beam which is supported by means of two or moresupporting arms 34 on the aforementioned shaft 17. The ledges 31 and 32are a sufficient distance apart for the warp yarns which form the shed22 to pass through between them. The shape of each channel-forming blade25 is essentially similar to that of a crescent whose convex edge facesthe beating-up point 23 and has the recess26 as well as the linearlyextending portion 30.

By the swinging of the supporting arms 34 by means of the shaft 17, thechannel-forming blades 25 can be moved with respect to the reed 12. Inorder to produce this movement, there is provided at least one link arm35 fastened to the shaft 17 and a link guide 36 arranged stationary inthe loom frame and into which a roller 37 rotatably supported on thefree end of the link arm 35 engages. The link guide 36 has a path 39which differs from a circular path 38 around the axis of swing of thelay swords 14 in such a manner that upon the beatingup movement of thelay II the channel-forming blades 25 move less far, i.e. by a smallerdistance, towards the filling yarn beating-up point 23 than do the teeth13 of the reed 11. In other words, this means that during the beating-upmotion of the lay 11, the teeth 13 of the reed 12 move forward towardsthe beating-up point 23 relative to the channel-forming blades 25.During the rearward movement of the lay 11, the channel-forming blades25 move less far so that they carry out a relative movement in directiontowards the beating-up point 23 relative to the teeth 13 of the reed 12.

In FIG. 1, the lay 11 is in its rear dead-center position, i.e. at itsgreatest possible distance from the beating-up point 23 ofthe fillingyarn The channel-forming blades 25 extend between the teeth 13 of thereed 12 to such an extent that the entire recess 26 of eachchannel-forming blade is located on the front side of the reed 12 facingthe beating-up point 23. With the parts in this position, a filling yarnis inserted by means of the fluid flowing through the main nozzle andthe auxiliary nozzles 28 into the guide channel which is formed by therecesses 26.

During the following forward movement of the lay 11 into the beating-upposition shown in FIG. 2, the shaft 17 is turned by the link guide 36,the roller 37 and the link arm 35 in such a manner that the supportingarms 34 and the channel-forming blades 25 are swung slightly to the leftas seen in the figures with reference to the reed 12, which has theresult that the channelforming blades 25 move less rapidly and thereforeover a smaller distance towards the beating-up point 23. The fillingyarn which was previously inserted is therefore pushed by means of theteeth 13 of the reed 12 out of the guide channel formed by the recesses26 and through the outlet openings 27 and beaten-up in customary manneronto the cloth 21 which has already been produced.

From FIG. 2 it can be noted that during the movements of thechannel-forming blades 25 which have been described there also takesplace a slight downward displacement with respect to the shed 22, thelinearly extending edge portion 30 of each channelforming blade comingto lie behind the previously inserted filling yarn, since the lattermust, after all, remain in the shed. Accordingly, the linearly edgedportions 30 also contribute towards the beating-up of the filling yarn.This action is obtained in particular when care is taken to see to itthat when the reed 12 is in the beating-up position the linear edgeportions 30 of the channel-forming blades 25 lie in the same plane asthe beating-up edges ofthe reed teeth 13. In FIG. 2, for the sake ofgreater clarity, the channel-forming blades 25 have been shown movedback slightly further so that the linear edge portions 30 of thechannel-forming blades are removed a small distance from the beatinguppoint 23. This solution is selected when a highly precise adjustment ofthe channel-forming blades 25 and- /or of the means serving for theirdrive is not necessary and can therefore be avoided.

When, after the beating-up of the filling yarn, the lay 11 moves backagain into its initial position shown in FIG. 1, the channel-formingblades 25 are then moved again forward relative to the teeth 13 of thereed 12 until the guide channel formed by the recess 26 for the fluidwhich serves for the insertion of the filling yarn is completely on thefront side or beating-up side of the reed.

It is clear that with the device described, the channel forming blades25 continuously remain between the warp yarns but periodically carry outa forward and backward movement with respect to the teeth 13 of the reed12 in such a manner that upon the insertion of each filling yarn theguide channel formed by the recess 26 of the channel-forming blades forthe fluid serving for the insertion of the filling yarn lies on thebeating-up side ofthe reed l2 and then upon the beating-up of thefilling yarn the channel-forming blades 25 move back relative to thereed 12 in order to enable the reed to beat-up in conventional manner.The stretchers 24 can therefore be arranged at an advantageously smalldistance in front of the beating-up point 23 without thereby enteringinto conflict with the channel-forming blades 25.

It will be appreciated that means other than those shown could beprovided for driving the channelforming blades 25 with respect to thereed 12.

It will be appreciated further that various changes and modificationsmay be made within the skill of the art without departing from thespirit and scope of the invention illustrated and described herein.

What is claimed is:

l. Loom having a device for the insertion of filling yarns by means of afluid, having a reed mounted on and swinging back and forth with a layfor beating-up of the filling yarn, comprising a comb of parallelchannel-forming blades defining a guide channel therein for fluidinsertion of the filling yarn, the channel-forming blades extendingfully through the warp threads at all times and each having a recesscorresponding to the cross-section of the guide channel, each saidrecess having an outlet opening which faces the beating-up line of thefilling yarns, each of the channel-forming blades engaging between teethof the reed and being mounted on the lay swords and swingable therewithand controlled by a guiding means with respect to the movement of thereed in such a manner that upon the beating-up movement of the reed thechannel-forming blades move a smaller distance towards the filling yarnbeating-up point than the teeth of the reed, the latter moving at leastup to the outlet openings of the channel-forming blades and pushing thefilling yarn previously inserted into the guide channel before thebeating-up of said yarn out of the guide channel.

2. Loom having a device according to claim 1 in which thechannel-forming blades are held by two parallel support ledges betweenwhich the warp yarns pass and in which the lower support ledge extendson the side of the reed facing away from the beating-up line.

3. Loom having a device according to claim 2 in which a ledge that holdsthe channel-forming blades in position is fastened to supporting armswhich are swingably connected to the lay, said supporting arms areoperatively seated on a shaft supported on the lay, to which shaft thereis furthermore operatively connected at least one link arm, a partthereof cooperating with a fixed guide, said guide having a course whichdiffers from an arcuate path provided by the axis of swing of the layswords so as to impart to the channel-forming blades a movement withrespect to the reed.

4. Loom having a device according to claim 2 in which thechannel-forming blades have approximately the shape of a crescent whoseconvex edge forms a recess that is faced towards the filling yarnbeating-up point.

5. Loom having a device according to claim 4 in which thechannel-forming blades each has a linear edge portion continuing fromthe outlet opening and is controlled in movement with respect to thereed by a guiding means in such a manner that, upon the beatingupmovement of the reed, the linear edge portion of each channel-formingblade comes to lie behind the filling yarn which has been previouslyinserted in the shed.

6. Loom having a device according to claim 5 in which in the beating-upposition of the reed, the linear edge portions of the channel-formingblades lie in the same plane as the beatingup edges of the reed teeth.

7. Loom having a device according to claim 1 in which thechannel-forming blades and the teeth of the reed alternate one after theother.

1. Loom having a device for the insertion of filling yarns by means of afluid, having a reed mounted on and swinging back and forth with a layfor beating-up of the filling yarn, comprising a comb of parallelchannel-forming blades defining a guide channel therein for fluidinsertion of the filling yarn, the channelforming blades extending fullythrough the warp threads at all times and each having a recesscorresponding to the cross-section of the guide channel, each saidrecess having an outlet opening which faces the beating-up line of thefilling yarns, each of the channel-forming blades engaging between teethof the reed and being mounted on the lay swords and swingable therewithand controlled by a guiding means with respect to the movement of thereed in such a manner that upon the beating-up movement of the reed thechannel-forming blades move a smaller distance towards the filling yarnbeating-up point than the teeth of the reed, the latter moving at leastup to the outlet openings of the channelforming blades and pushing thefilling yarn previously inserted into the guide channel before thebeating-up of said yarn out of the guide channel.
 2. Loom having adevice according to claim 1 in which the channel-forming blades are heldby two parallel support ledges between which the warp yarns pass and inwhich the lower support ledge extends on the side of the reed facingaway from the beating-up line.
 3. Loom having a device according toclaim 2 in which a ledge that holDs the channel-forming blades inposition is fastened to supporting arms which are swingably connected tothe lay, said supporting arms are operatively seated on a shaftsupported on the lay, to which shaft there is furthermore operativelyconnected at least one link arm, a part thereof cooperating with a fixedguide, said guide having a course which differs from an arcuate pathprovided by the axis of swing of the lay swords so as to impart to thechannel-forming blades a movement with respect to the reed.
 4. Loomhaving a device according to claim 2 in which the channel-forming bladeshave approximately the shape of a crescent whose convex edge forms arecess that is faced towards the filling yarn beating-up point.
 5. Loomhaving a device according to claim 4 in which the channel-forming bladeseach has a linear edge portion continuing from the outlet opening and iscontrolled in movement with respect to the reed by a guiding means insuch a manner that, upon the beating-up movement of the reed, the linearedge portion of each channel-forming blade comes to lie behind thefilling yarn which has been previously inserted in the shed.
 6. Loomhaving a device according to claim 5 in which in the beating-up positionof the reed, the linear edge portions of the channel-forming blades liein the same plane as the beatingup edges of the reed teeth.
 7. Loomhaving a device according to claim 1 in which the channel-forming bladesand the teeth of the reed alternate one after the other.